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Updated: Jul 20, 2026

In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
Published on: September 2, 2016
On measurement of molecular and thermal diffusion coefficients in multicomponent mixtures
Kjetil B Haugen1, Abbas Firoozabadi
1Chemical Engineering Department, Yale University, P.O. Box 208286, New Haven, Connecticut 06520-8286, USA.
Abstract:
We have developed the theory for using the deflection of laser beams of various wavelengths to determine molecular and thermal diffusion coefficients in multicomponent mixtures. In the past, simultaneous determination of molecular and thermal diffusion coefficients have only been achieved for binaries. Our procedure is faster and more accurate than the current techniques to determine molecular diffusion coefficients. The analysis for an N-component mixture requires deflections from (N - 1) beams of different wavelengths. We show in an example that the molecular and thermal diffusion coefficients can be determined reliably in a ternary mixture.
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